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PATIKIL Lab Stand Set, 16 Inch Lab Stand & Clamp Set, 1 Set Stand Support with 1 Flask Clamp & 2 Retort Rings for Chemistry Laboratory, Black: Amazon.com: Industrial & Scientific
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MansionSchools.com : Frey Scientific Support Stand with Rings, 5 X 8 in Base, 20 in Rod, Includes 3 Rings : Learning: Science
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